Brake-operating device



Aug, 14, 1923.

H. F. HARDIN BRAKE OPERATING DEVICE Filed April 26 1921 Patented Aug.14, 1923.

unites stares Mtdfiti PATENT HOMER F. HARD IN, ,OF HOUL'ION, OREGON,ASSIGNOE TO HARDIN MFG: COMPANY,

OF KALAMA, WASHINGTON, A CORPORATION.

BRAKE-OPERATING- DEVICE.

Application filed April 26, 1921. Serial No. 464,552.

To all w 7mm it may concern Be it known that I, I'IOMER F. HARDIN, acitizen of the United States, residing at Houlton, in the county ofColumbia and State of Oregon, have invented certain new and usefulImprovements in Brake-Operating- Devices; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tmake and use the same.

The present invention relates generally to brakes, and more especiallyto operating devices for brake bands, it being the object of theinvention to provide a novel and improved double lever or toggle devicefor-operating the brake band in an efiicient manner and withconsidenblepower.

Another object is the provision of such a double lever or toggle deviceof novel form andso mounted and connected to the ends of the brake bandas to obtain a compact relation of theparts when the brake is released,and to also obtain a powerful grip when the brake is applied.

With the foregoingand other objects in view, which will be understood asthe de-' Figure 1 is a side elevation of a brake drum' and band showingthe improved operating device applied.

Fig. 2 is a detail plan view of one of the retaining means for thebrake. band:

In the drawing, there is shown a brake drum 5 surrounded by the flexiblebrake band 6 which has the friction lining 7 to grip the periphery ofthe brake drum. A retaining piece 8 is secured to the brake bandintermediate its ends and has an offset portion 9 to receive an anchorlug or finger 10 to prevent the rotation of the brake band, and toanchor the intermediate portion thereof in place. The brake band is alsoslidably anchored between the intermediate portion and ends by means ofretaining pieces or straps 11 secured to the band at such points andhaving ofiset portions 12 retween the ends of the brake band.

cludes a pair of crossed levers 15 pivoted at I the r point of crossing,as at 16, to a sup porting .bracket or arm 17 substantially be- Thelevers 15 have the short arms 18 projecting toward the ends of thebrake, band, and pivotally connected to adjusting screws or stems 19which are slidable through pairs of ears 20. outstanding from plates orpieces 21 secured on the end portions of the brake band, and adjustingnuts 22 are threaded on said stems and are located between the ears 20,whereby said nuts can be adjusted for contracting the brake band, fromtime to time, in order to take up the wear of the lining 7.

' The lever 15 have the long arms 23, and the levers are curved or bentnear the pivot 16, so that the long and short arms are arranged atobtuse angles with one another, so'that when the arms 18 are separatedfor expanding the brake band, the arms 23 are swung close adjacent tothe ends of the brake band, as seen in full lines in Fig. 1, to providea compact arrangement of the device in its normal position.

A pair of toggle links 24 are pivoted at their opposite ends, as at 25,to the ends of the arms 23, and their adjacent ends are pivoted, as at26, to an operating rod 27 which is reciprocated by an operating lever,pedal, or the like (not shown).

Under normal conditions, when the brake is released, the rod 27 isshoved toward the brake drum 5, whereby the links 2& swing the arms 23toward the drum, thereby separating the arms 18 and ends of the brakehand. so as to expand said band and release the drum 5. In this positionof the parts, as seen in full lines in Fig. 1, the arms 23 of the doublelever toggle device are positioned close to the end portions of thebrake band, with the links 24 arranged adjacent to said arms 23, andsaid arms 23 and links 24 diverge in the direction of the brake drum. Inthis position of the levers, the long arms thereof are moved to orslightly beyond a other and pull the ends of the brake band toward oneanother, thereby contracting the brake band on the drum. Owing to thetoggle action and tlie leverage obtained, the brake band will becontracted with considerable force to obtain an effective grip on thebrake drum, and due to the shape of the levers 15, maximum powerisobtained by the swinging of the arms 23 away from the drum past aposition of the arms in alineinent with one another.

The brake mechanism is adapted especially .for use on automobiles andother motor vehicles, but can be used generally, however, wherever brakedrums are ernplo'yed. V

Having thus described the invention, what is claimed as newis 1 A brakeoperating device including in combination with a brakecband, a bracketrigidly supported between the ends of the band, a pair of leverscrossing one another and pivoted atthe point of crossing to said bracketsubstantially between the ends of 1 said band, said levers having shortarms projecting toward the ends of the band and operatlvely connectedthereto, and having 1on arms and operatin means connected to h a b saidlong arms of the levers for swinging the short arms toward one another.

2. A brake operating device including in combination with a brake band,a bracket, ajpair of levers crossing one another and pivoted at'thepoint of crossing to said bracket substantially between the ends of saidband, said levers having short arms projecting .toward the ends or theband and operatively connected thereto, and having long arms, anoperating rod, and toggle links connecting said long arms and rod.

3. A brake operating device including in combination with a brake band,a bracket, a pair of crossed levers pivoted at their point of crossingto said bracket having nected with the end portions of said band,

said levers having long arms arranged at obtuse angles with the shortarms to move close adjacent to the end portions of the band to or beyonda line intersecting said pivot at right angles to the radiusline of thebrake band which intersects the pivot, an operating rod, andtoggle linksconnecting said long arms and rod and movable adjacent to said long armswhen the short arms. are separated.

5. A brake opera-tingdevice including in combination with a brake band,a bracket, a pair of crossed levers pivoted at their point of crossingto said bracket substantially between the ends of said band, said levershaving short arms projecting toward and pivotally connected with the endportions of said band, and having long arms arranged at obtuse angleswith the short arms to move adjacent to the end portions of the bandwhen the short arms are separated to or beyond a line intersecting saidpivot at right angles to the radius line of the brake band whichintersects the pivot, an operating rod, and toggle links connecting thelong arms and rod to move adjacent to said long arms when the short armsare separated. i

p In testimony whereof I have signed my name to this specification inthepresence of two subscribing witnesses.

HOMER F. HARDIN.

Witnesses: i V

H. J Son'rHARn, T. S. WHITE.

